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20 April 2024 |
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Article overview
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Superconductivity in CaSn3 single crystal with a AuCu3-type structure | | X. Luo
; D. F. Shao
; Q. L. Pei
; J. Y. Song
; L. Hu
; Y. Y. Han
; X. B. Zhu
; W. H. Song
; W. J. Lu
; Y. P. Sun
; | | Date: |
20 Nov 2015 | | Abstract: | We report the superconductivity of the CaSn3 single crystal with a AuCu3-type
structure, namely cubic space group Pm3m. The superconducting transition
temperature TC=4.2 K is determined by the magnetic susceptibility, electrical
resistivity, and heat capacity measurements. The magnetization versus magnetic
field (M-H) curve at low temperatures shows the typical-II superconducting
behavior. The estimated lower and upper critical fields are about 125 Oe and
1.79 T, respectively. The penetration depth lambda(0) and coherence length
xi(0) are calculated to be approximately 1147 nm and 136 nm by the
Ginzburg-Landau equations. The estimated Sommerfeld coefficient of the normal
state {gamma}_N is about 2.9 mJ/mol K2. {Delta}C/{gamma}NTC =1.13 and
{lambda}ep=0.65 suggest that CaSn3 single crystal is a weakly coupled
superconductor. Electronic band structure calculations show a complex
multi-sheet Fermi surface formed by three bands and a low density of states
(DOS) at the Fermi level, which is consistent with the experimental results.
Based on the analysis of electron phonon coupling of AX3 compounds (A=Ca, La,
and Y; X=Sn and Pb), we theoretically proposed a way to increase TC in the
system. | | Source: | arXiv, 1512.2514 | | Services: | Forum | Review | PDF | Favorites | |
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